Sync InvoiceGuard code for GRPO training job

training/launch_hf_job.py

@@ -65,10 +65,15 @@ def upload_code(hf_username: str, code_repo_name: str) -> str:
 def submit_job(args: argparse.Namespace, code_repo_id: str) -> None:
     from huggingface_hub import run_uv_job
 
-    script = TRAIN_SCRIPT.read_text(encoding="utf-8")
+    # `run_uv_job`'s Python API expects a local path or URL. Passing the script
+    # contents directly makes Jobs try to spawn a command whose "filename" is
+    # the entire source file. Use the script we just uploaded to the code repo.
+    script_url = (
+        f"https://huggingface.co/{code_repo_id}/resolve/main/training/train_grpo.py"
+    )
 
     job = run_uv_job(
-        script=script,
+        script=script_url,
         flavor=args.flavor,
         timeout=args.timeout,
         secrets={"HF_TOKEN": "$HF_TOKEN"},